Charles Ellicott Commentary Psalms 29:2

"Ascribe unto Jehovah the glory due unto his name; Worship Jehovah in holy array." — Psalms 29:2 (ASV)

In the beauty of holiness. —Better, in holy attire; an image borrowed from the splendid vestments of the priests and Levites (2 Chronicles 20:21; Psalms 110:3). So the presences that attend the courts of heaven are called to be robed in their most magnificent attire, as for a high and sacred ceremony.